You’ve probably seen Spencer on one of your favorite shows — she’s currently appearing on the Jada Pinkett Smith drama Hawthorne, following roles on Castle, Mad Men, How I Met Your Mother and Private Practice. You can also catch her in the upcoming comic book flick Cowboys and Aliens, which will feature A-listers like Harrison Ford, Daniel Craig, Olivia Wilde and Sam Rockwell (Steven Spielberg is a producer).

“I think it’s as big as it gets,” she told us. “I was just added to the cast. I’ve had a very Hollywood week!”

With so much going on (Spencer also has a 2-year-old son), the in-demand actress finds it hard to make time for her beauty and fitness routine. So she developed what she calls a “compressed beauty regimen” involving two key secrets.

“I used to work out all the time, but after I had my son I was like ‘no more,'” she reveals. “I’ve only done Pilates since I had my son — I gained 40 pounds of pregnancy weight and lost of all of it without dieting. I’m in way better shape than I was before my pregnancy!”

Spencer swears she’s only made one other major change — she’s subbed out coffee in favor of Steaz tea.

“I gave up all unnatural sugars and all unnatural ingredients. I gave up coffee; now I only drink Steaz, which is an all-natural green tea-based drink. These were the only two things that I did differently, and I noticed a world of difference,” she says.

Now, Abby looks better than she has in her whole life — and her girlfriends were noticing.

“They were like, ‘What are you doing?’ So I thought, “Why don’t I do a summer kick-off party for my girlfriends and do my deal?”

The event featured Spencer’s “secret celebrity Pilates trainer” Jessica McTighe (“She trains so many high-profile people in L.A., but nobody knows about her. She’s like the secret weapon”); Katie Ladner’s all-natural spray tans; Osmosis facials; “Skin So Sweet” sugaring hair removal (“I’m part Cherokee and I have a lot of hair — it’s an issue”); Beyond Yoga’s “so soft” line of yoga and Pilates gear and other products and treatments.

Spencer says there’s no reason why you can’t get your girlfriends together and share your own beauty secrets. She also asked all of her celeb guests to reveal their favorite stay-healthy secret. Click through our slideshow to see what they said!